darryldds

My winter project involves having my mechanic drop the engine and finally put to rest the oil leaks and other preventive work. She is a 1998 C2S with 100K miles. She does occasional street driving but is mostly trailered to the track to do 18 DE days a season. Racing seats, Das Sport Roll Bar and R compound tires. Looking for opinions on pros and cons of putting in a short shifter and swapping the original clutch for a RS light weight SMF. Will have to wait till next winter to consider upgrading the suspension someway. Any opinions would help work to be started this week

Mark in Baltimore

If it's that pure of a track car, an RS flywheel is fine. Why not put in a 996 cup car clutch? It's far more durable for track work than the RS one and not too bad for occasional street driving in terms of heaviness.

jdistefa

Would it help you if i told you i have an RS flywheel and clutch for sale?

PM sent....

jscott82

For a track car the lighter the better.
1) Improved ability to rev match downshifts (huge benefit here).
2) Improved throttle response, making it easier to control the car "on the edge".
3) Not so obvious is improved braking.. with a heavy flywheel the initial "grab" is muted as the flywheel continues to push the car. The higher the gear the more impact.
4) The RS or cup flywheel is more durable as well.

The only downside is noise, with an RS flywheel the transmission sounds like a box of loose bolts... Not too fun t explain to you passengers... "its not broken, its supposed to sound like that"

Oh, and there is the potential for stalling, a new chip can usually fix that. Or just a simple tap on the throttle as the car comes to a stop will do too... Just need to get used to it and its a non-issue.

For a mostly track car, its a no-brainier in my book.

As far as short shifter, I didn't notice any real change... replacing the shift rod with RS rod does make it feel tighter but not so sure it makes a meaningful improvement though.

Mark in Baltimore

If you're remotely contemplating campaigning your 993 in PCA club racing, a cup car flywheel of any sort is not currently allowed. Even if you're not, if you ever sell your semi-track car, you'll want it to appeal to the PCA race car buyer as well as the DE buyer (NASA buyers notwithstanding. )

jscott82

It not??? Its still steel flywheel, its been awhile since I checked the regs... but I thought the only requirement was the flywheel had to be steel...

Mark in Baltimore

Hey, Jeff,

If you read Paragraph 1 (Engine), subparagraph L, third bullet point, it says that the "'95-'98 993 may use 993 RS flywheel". Assuming that PCA is operating under the oft-used "if it's not stated, it's not allowed" premise, it appears that a 996 cup flywheel is not allowed. I'm not 100% sure, but that's how I read it. Best to ask Ray Newman.

mhm993

Darryl
RS clutch LWS is great for a street legal but mostly track car. Downside is it sounds like a bag of bolts accelerating and you'll need to drive the throttle a bit differently. You get accustomed to both quickly. Short shift is nifty.

email me if you'd like. MHM

darryldds

Thanks all for your feedback very helpful.

Bill Verburg

993RS used the same dual mass flywheel as all normal 993
993RS/CS used the 964 singlemass flywheel and this is legel per 2011 PCA Club racing regs
STOCK CARS - Classes A thru L
1. Engine
.....
L. The dual mass flywheel on a 964, 968, or 993 may be replaced with a single mass, ferrous material (magnetic) flywheel. Aluminum flywheels with a ferrous wear surface are not allowed. The clutch disk must be the stock diameter. Suggested substitutions are:  ‟90-‟94 911 or RS America may use 964 RS flywheel  ‟95-‟98 993 may use 993 RS flywheel  968 may use 944S2 or 968 Turbo S flywheel. The matching clutch and bell housing is allowed.  Boxsters, Caymans, 996, 997, and GT3 cars which changed to a single mass flywheel before the publication of the 2011 rules change approval may retain that flywheel during 2011.

Bill Verburg

What are you doing now?